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Abstract

The ITER divertor vertical target has to sustain heat fluxes up to 20MWm-2. The concept developed for this plasma facing component working at steady state is based on carbon fibre composite armour for the lower straight part and tungsten for the curved upper part. The main challenges involved in the use of such components include the removal of the high heat fluxes deposited and mechanically and thermally joining the armour to the metallic heat sink, despite the mismatch in the thermal expansions. Two solutions based on the use of a CuCrZr hardened copper alloy and an active metal casting (AMC) process were investigated during the ITER EDA phase: the first one called �flat tile geometry� was mainly developed for the Tore Supra pumped limiter, the second one called �monoblock geometry� was developed by the EU Participating Team for the ITER project. This paper presents a review of these two solutions and analyses their assets and drawbacks: pressure drop, critical heat flux, surface temperature and expected behaviour during operation, risks during the manufacture, control of the armour defects during the manufacture and at the reception, and the possibility of repairing defective tiles.

Additional information

Authors: SCHLOSSER J, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ESCOURBIAC F, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);FOUQUET S, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BAYETTI P, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);CORDIER J J, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GROSMAN A, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MISSIRLIAN M, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MEROLA M, EFDA Close Support Unit, Garching (DE);TIVEY R, ITER International Team, Garching (DE);RODIG M, Forschungszentrum Julich GmbH, Julich (DE);RÖDIG M, Forschungszentrum Jülich GmbH, Jülich (DE)
Bibliographic Reference: An article published in: Nuclear Fusion 45 (2005) 512�518
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: stacks.iop.org/NF/45/512
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